Ok, so I've spent a bit more time this afternoon swapping Diva23 back and forth between the stock Ares S and the LL Martini cables, and my verdict is... that they sound nearly identical.
What difference I do hear is incredibly small, and I have to close my eyes to shut out any other distractions to notice, but the LL Martini is ever so slightly tighter and more 'controlled' than the Ares S. There is just a very faint increase in noise around the notes with the Ares S, mostly in the upper midrange and treble, with just a hint of edginess by comparison to the LL Martini. That's not to say Diva is in any way harsh or edgy at all, it's just that the LL Martini takes what's already a great IEM and refines it a bit.
The biggest differences I'm hearing with Diva, are (unsurprisingly) by adjusting the tuning switches. Going 'bass lite' with the white setting does give the feeling of opening them up a bit and making them sound a bit wider and more expansive, so maybe that's a soundstage improvement? Of course that's at the expense of a lot of sub-bass energy, but you can't get something for nothing I guess.
Have to say, the more time I'm spending with Diva, the more impressed I am with it, despite the fact I'm spoiled to have it's big sister Anni in my collection. I'll write up a more in depth impressions post in a couple weeks, but Diva is a very strong contender in it's price class with it's fun lively presentation that has the all-important factor of making me want to 'play just one more track'